Li<sub>10</sub>SnP<sub>2</sub>S<sub>12</sub>: An Affordable
Lithium Superionic Conductor
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Abstract
The
reaction of Li<sub>2</sub>S and P<sub>2</sub>S<sub>5</sub> with
Li<sub>4</sub>[SnS<sub>4</sub>], a recently discovered, good Li<sup>+</sup> ion conductor, yields Li<sub>10</sub>SnP<sub>2</sub>S<sub>12</sub>, the thiostannate analogue of the record holder Li<sub>10</sub>GeP<sub>2</sub>S<sub>12</sub> and the second compound of this class
of superionic conductors with very high values of 7 mS/cm for the
grain conductivity and 4 mS/cm for the total conductivity at 27 °C.
The replacement of Ge by Sn should reduce the raw material cost by
a factor of ∼3
